About an hour and 20 minutes after the partial eclipse phase begins, the Moon will pass completely in front of the Sun, leaving a “ring” of Sun visible from behind the Moon. This period is known as annularity, or second contact. It will last between 1 and 5 minutes for most places, depending on where you view it from. During the eclipse, the sky will grow dimmer, though not as dark as during a total solar eclipse. Some animals may begin to behave as if it is dusk and the air may feel cooler.